Overcoming the Stablecoin Trilemma: Designing and Simulating a Decentralized, Stable, and Capital-Efficient Peg Maintenance System

Abstract

The Stablecoin Trilemma—balancing stability, decentralization, and capital efficiency—remains a significant challenge in the decentralized finance (DeFi) landscape. This study introduces an innovative stablecoin system, USC, designed to overcome the inherent limitations of existing models by simultaneously achieving stability, decentralization, and capital efficiency. The USC system leverages a combination of decentralized assets, including the hypothetical native token CAPE and ETH, integrated through key components such as the Treasury, Treasury Credit Module, CAPE Bonder, and Merchant. A comprehensive Python-based simulation spanning 298 days was conducted to evaluate the system’s performance under varying market conditions. ETH price movements were meticulously modeled using historical data from the Binance/USDT trading pair, with specific periods of daily growth and decline to test the system’s resilience. Additionally, CAPE price determination was simulated using a hypothetical liquidity pool. The simulation results demonstrated that the USC system effectively maintained the usc_support metric above the critical threshold of 1 throughout the study period, indicating that each USC remained fully backed by the underlying assets. The Treasury Credit Module played a crucial role by offering a stable 10% Annual Percentage Rate (APR), incentivizing participants to lock their USC and thereby reducing the circulating supply during asset depreciation periods. Furthermore, the Merchant component provided a substantial safety net with a borrowing capacity of up to 67,315 ETH (approximately $160.6 million at the simulation’s final ETH price), which is nearly three and a half times the Treasury’s holdings. This extensive liquidity provision enhanced the system’s ability to maintain stability during significant market downturns. However, the study acknowledges several key limitations, including the lack of realistic participant behavior modeling, the absence of external shocks such as regulatory changes or technological failures, and the lack of empirical validation through real-world testing. These limitations highlight the need for further research and development to address behavioral complexities, incorporate unforeseen variables, and validate the system’s performance in live environments. In conclusion, the USC stablecoin system presents a promising framework for resolving the Stablecoin Trilemma by integrating decentralized assets and innovative financial mechanisms. While the simulation results are encouraging, demonstrating robust stability, the system’s practical implementation will require overcoming significant technical, regulatory, and operational challenges.